PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 2 (2016) 801–808 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000

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XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Thermo-mechanical modeling of a high pressure turbine blade of an airplane gas turbine engine P. Brandão a , V. Infante b , A.M. Deus c * a Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal b IDMEC, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal c CeFEMA, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal Abstract During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Investigation of fatigue crack growth in a power plant steel under elevated temperatures Patrick Mutschler*, Manuela Sander Institute of Structural Mechanics, University of Rostock, Albert-Einstein-Str. 2, 18059 Rostock, Germany The definition of inspection intervals on the basis of fracture mechanics requires beside the knowledge of the load e.g. in terms of stress intensity solutions also the knowledge of the material parameters e.g. in terms of crack growth data. For this reason, fatigue crack gr wth curves were determined for a ferritic-martensitic pow r plant steel at elevated temperatures. Therefore, an experimental setup was developed. The fatigue crack growth tests are performed on C(T)-specimens, which are manufactured with varied orientations from a high pressure bypass valve (HP-Bypass) which was exchanged at a revision. The isothermal test for determining the threshold values as well as the fatigue crack growth data in the Paris-regime have been performed at room temperature and at temperatures between T = 300 °C and T = 600 °C. Beside the temperature, the R -ratio, the specimen ori ntation, the frequency nd the normalized K -gradient are varied. The i fluences of all investigated parameters are evaluated and the main factors a e id ntified. For statistical evaluation of the crack growth ata quantil curves are created from the crack gr wth data as a function of the main factors. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: power plant; thermal influence; crack growth curves; quantil curves; Forman-Mettu-equation c Copyright © 2016 The Auth rs. Published by Elsevier B.V. This is an open access article u der the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of ECF21. Abstract

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© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Due to the strongly fluctuating energy supply of renewable energies in future entirely new challenges will arise for conventional power plants. This will lead to a much more fl xible operation of conventional power plants, because there is currently no storage media, which can absorb completely these variations. This new, enhanced

* Corresponding author. Tel.: +49 -381-498-9020; fax: +49-381-498-9342. E-mail address: Patrick.mutschler@uni-rostock.de

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.103